CN104912522B - Combined drainage and mining device and technology for coal-bed gas well in high stress area - Google Patents
Combined drainage and mining device and technology for coal-bed gas well in high stress area Download PDFInfo
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- CN104912522B CN104912522B CN201510236023.7A CN201510236023A CN104912522B CN 104912522 B CN104912522 B CN 104912522B CN 201510236023 A CN201510236023 A CN 201510236023A CN 104912522 B CN104912522 B CN 104912522B
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- 238000005065 mining Methods 0.000 title claims abstract description 51
- 238000005516 engineering process Methods 0.000 title abstract description 3
- 239000003245 coal Substances 0.000 claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000005086 pumping Methods 0.000 claims abstract description 11
- 230000006641 stabilisation Effects 0.000 claims abstract description 8
- 238000011105 stabilization Methods 0.000 claims abstract description 8
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 21
- 230000004087 circulation Effects 0.000 claims description 15
- 230000000087 stabilizing effect Effects 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 6
- 239000013049 sediment Substances 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 5
- 230000003111 delayed effect Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 description 43
- 210000002683 foot Anatomy 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a combined-layer drainage device and a combined-layer drainage technology for a coal bed gas well in a high stress area, wherein the drainage device comprises a beam-pumping unit, an underground drainage pipe column and a monitoring control system; the underground production string comprises an oil pipe arranged in a production casing of the coal-bed gas well, a sucker rod arranged in the oil pipe and connected with the beam pumping unit, and a tubular pump, a tail pipe, a pressure gauge supporting cylinder, a gas anchor, a wire-wound sieve tube, a sand-settling tube and a plug which are sequentially connected with the bottom of the sucker rod; the monitoring control system comprises a sleeve pressure gauge and a needle valve which are arranged on a gas production pipeline of the production casing, a plug valve arranged on a drainage pipeline of an oil pipe and a double direct-reading electronic pressure gauge arranged in a pressure gauge support cylinder; the drainage and mining process comprises a plurality of drainage and mining cycles, wherein each cycle is divided into four stages of drainage pressure building, pressure stabilization and yield increase, pressure control and yield stabilization and pressure reduction and attenuation. The method solves the problem that the coal reservoir is easy to damage under the condition of combined-layer drainage and mining in the high stress area, and can obviously prolong the high-yield and stable-yield time of the coal-bed gas well.
Description
Technical field
The invention belongs to mining of coal bed gas technical field, more particularly to a kind of region of high stress coal bed gas well closes layer mining
Device and technique.
Background technology
China's coal bed gas resource enriches, and buried depth 2000m is with shallow coal bed gas geological resources up to 36.8 × 10 for prediction12m3, with
Conventional gas stock number is suitable.Coal bed gas scale exploitation can alleviate China's conventional gas and oil energy shortage situation, reduce coal
Ore deposit gas accident occurrence probability, reduce coal production greenhouse Gas Emission amount, can produce significant economy, environment, safety and
Social benefit.
Southwestern China area coal bed gas resource with Eastern Yunnan Province And Guizhou Province, china as representative enriches, and development of resources has a high potential.The eastern regions of the Yunnan Province Guizhou Province
West is located in China's region of high stress, and coal seam reservoirs pressure, gas saturation are high, and the development of upper Permian series coal measures coal seam group, single coal in area
Thickness degree is small, coal bed gas resource abundance is low.Therefore, it is that Eastern Yunnan Province And Guizhou Province, china area coal bed gas Ground Developing is passed through to carry out closing layer exploitation
The premise of benefit of helping.In order to push forward the coal bed gas ground survey development of Southwestern China area comprehensively, it is necessary to solve high stress
Coal seam reservoirs are easily injured during area's coal bed gas well closes floor mining, and coal bed gas well is difficult to the technical barrier of long-term high yeild, stable yields.
The content of the invention
Layer mining device and technique are closed it is an object of the invention to provide a kind of region of high stress coal bed gas well, to solve existing skill
Region of high stress coal seam reservoirs sensitiveness present in art is strong, closes vulnerable during layer mining, coal bed gas well be difficult to long-term high yeild,
The problem of stable yields.
To achieve the above object, the present invention uses following technical scheme：
A kind of region of high stress coal bed gas well closes layer mining device, including beam pumping unit, underground mining tubing string and monitoring
Control system；
The beam pumping unit is arranged on ground；
The underground mining tubing string includes the oil pipe being arranged in coal bed gas well production casing, is arranged in oil pipe and walking beam
Formula oil pumper connection sucker rod and be sequentially connected with sucker rod bottom tubing pump, tail pipe, manometer, gas anchor, around
Silk sieve tube, sand sediment pipe and plug；
The monitor control system includes the casing pressure table being arranged on the flow line of production casing and needle valve, is arranged on
Plug valve on the flowing line of oil pipe and the double Read-Out Electronic Gauges being arranged in manometer, double direct-reading electronics pressures
Power meter is connected by cable with the temperature and pressure display instrument for being arranged at ground.
Further, the length of the sand sediment pipe is 15m-20m, and the length of wire-wrapped screen is 3m-5m, and the length of tail pipe is
20m-25m。
Further, the wire-wrapped screen bottom is located at 2m on the top surface in foot exploitation coal seam.
A kind of region of high stress coal bed gas well closes layer mining technique, and the mining technique includes multiple mining circulations, each mining
Circulation be divided into draining build the pressure, voltage stabilizing volume increase, pressure control stable yields, step-down decay four-stage.
Built the pressure the stage in the draining of the first mining circulation, close the needle valve of well head, the control of coal bed gas well displacement exists
2m3/d-4m3/ d, when casing pressure rises to 1.4MPa-1.6MPa, the stage is increased production into voltage stabilizing；Increase production stage, day draining in voltage stabilizing
Amount increases to 4m3/d-8m3/ d, is gradually reduced annulus liquid level, casing pressure stabilization is maintained by adjusting needle valve, when coal bed gas well day
Gas production increases to 2000m3During/d, into the pressure control stable yields stage；In the pressure control stable yields stage, keep casing pressure and daily output tolerance steady
Fixed, the control of the annulus liquid level range of decrease, when annulus liquid level is down to topmost exploitation roof position, is entered in 1.5m/d-2.5m/d
Enter to be depressured the decling phase；In the step-down decling phase, casing pressure, control ring are slowly reduced with the speed of 0.01MPa/d-0.03MPa/d
Empty liquid level 10m-20m on topmost exploitation coal seam, makes coal bed gas well produce tolerance daily and slowly declines；When casing pressure drops to
During 0.4MPa, into the circulation of the second mining；
Built the pressure the stage in the draining of the second mining circulation, annulus liquid level is slowly dropped to topmost by increasing day displacement
Under exploitation coal seam, and higher than the second exploitation coal seam, and casing pressure is set to gradually rise to 1.2MPa；Then, carry out the second mining to follow
The follow-up voltage stabilizing volume increase of ring, pressure control stable yields, step-down decling phase operation；When casing pressure drops to 0.4MPa again, into the 3rd
Mining is circulated；By that analogy, until annulus liquid level is down to foot exploitation roof position.
The beneficial effects of the invention are as follows：Compared with current coal bed gas well closes layer mining device and technique, using of the invention
Device and technique, can as far as possible avoid coal bed gas well under condition of high ground stress from closing the reservoir damage produced by layer mining, significantly extension
Coal bed gas well high yield, stable production period, make coal bed gas Ground Developing obtain more preferable economy, environment and social benefit.
Brief description of the drawings
Fig. 1 is that region of high stress coal bed gas well of the invention closes layer mining schematic device.
In figure：1- beam pumping units；2- plugs；3- sand sediment pipes；4- wire-wrapped screens；5- gas anchors；6- manometers；7-
Tail pipe；8- tubing pumps；9- oil pipes；10- sucker rods；11- casing pressure tables；12- needle valves；13- plug valves；14- temperature and pressure display instruments；
15- cables；The double Read-Out Electronic Gauges of 16-；17- annulus liquid levels；18- foots develop coal seam；19- topmosts develop coal seam；
20- second develops coal seam；21- production casings；22- flow lines；23- flowing lines.
Specific embodiment
Present invention work is further retouched in detail with as a example by the coal bed gas well of Guizhou Province Liu Panshui coalfields below in conjunction with the accompanying drawings
State, but do not limit practical range of the invention.
The suitable ground location of landform, geological conditions is selected in work area as well site, construction coal gas straight well or maximum
Directional well of the hole deviation less than 35 °.Coal bed gas well has " two opening structures ", and one spuds in footpath15m under basement rock is drilled into, under
Enter external diameterThe surface pipe of J55 grade of steels is simultaneously cemented the well, and cementing slurry returns to ground；Two spud in footpath
Be drilled into foot exploitation coal seam 18 under 50m finishing drillings, under enter external diameterThe production casing of N80 grade of steels is simultaneously cemented the well, and two open
Cementing slurry returns to 200m on topmost exploitation coal seam 19.
After layering perforation, fracture job terminate, slow draining overflow to well head pressure is zero, and ground connects and installs high stress
Area's coal bed gas well closes floor mining device.Region of high stress coal bed gas well closes layer mining device includes beam pumping unit 1, underground mining
Tubing string, monitor control system.Beam pumping unit 1 is arranged on ground；Underground mining tubing string includes being arranged on coal bed gas well production
Oil pipe 9 in sleeve pipe 21, be arranged on the sucker rod 10 that is connected with beam pumping unit 1 in oil pipe 9 and with the bottom of sucker rod 10
Tubing pump 8, tail pipe 7, manometer 6, gas anchor 5, wire-wrapped screen 4, sand sediment pipe 3 and the plug 2 being sequentially connected；Survey control system
Including the casing pressure table 11 being arranged on the flow line 22 of production casing 21 and needle valve 12, it is arranged on the flowing line of oil pipe 9
Plug valve 13 on 23 and the double Read-Out Electronic Gauges 16 being arranged in manometer 6, double Read-Out Electronic Gauges 16
It is connected with the temperature and pressure display instrument 14 for being arranged at ground by cable 15, downhole temperature, pressure data are transmitted to temperature by cable 15
Pressure display instrument 14.
In the mining tubing string of underground, the length of sand sediment pipe 3 is 18m, and 4 length of wire-wrapped screen are 4m, and the length of tail pipe 7 is
21m。
When underground mining tubing string enters well operations, the bottom of wire-wrapped screen 4 is located at 2m on the top surface in foot exploitation coal seam 18.
Under lower going-into-well after mining tubing string, gas production wellhead, air water pipeline, set power table 11, needle valve 12, plug valve are installed in ground
13 etc..
Built the pressure the stage in the draining of the first mining circulation, close the needle valve 12 of well head, the control of coal bed gas well displacement exists
2m3/d-4m3/ d, when casing pressure rises to 1.4MPa-1.6MPa, the stage is increased production into voltage stabilizing；Increase production stage, day draining in voltage stabilizing
Amount increases to 4m3/d-8m3/ d, is gradually reduced annulus liquid level 17, and casing pressure stabilization is maintained by regulation needle valve 12 in time, works as coal
Layer gas well daily output tolerance increases to 2000m3During/d, into the pressure control stable yields stage；In the pressure control stable yields stage, casing pressure and daily output are kept
Tolerance stabilization, the range of decrease of annulus liquid level 17 control is down to topmost exploitation coal seam 19 and is pushed up in 1.5m/d-2.5m/d, when annulus liquid level 17
During Board position, into the step-down decling phase；In the step-down decling phase, slowly reduced with the speed of 0.01MPa/d-0.03MPa/d
Casing pressure, control annulus liquid level 17 10m-20m on topmost exploitation coal seam 19, makes coal bed gas well produce tolerance daily and slowly declines；
When casing pressure drops to 0.4MPa, into the circulation of the second mining.In the present embodiment, built the pressure the stage in draining, coal bed gas well draining
Amount control is in 3m3/ d or so, when casing pressure rises to 1.5MPa or so, the stage is increased production into voltage stabilizing；Increase production stage, day in voltage stabilizing
Displacement increases to 6m3/ d or so, casing pressure stabilization is maintained in 1.5MPa or so by regulation needle valve 12 in time；In pressure control stable yields
Stage, the range of decrease of annulus liquid level 17 is controlled in 2m/d or so；In the step-down decling phase, slowly dropped with the speed of 0.02MPa/d or so
Low casing pressure, control annulus liquid level 17 15m or so on topmost exploitation coal seam 19.
Built the pressure the stage in the draining of the second mining circulation, make annulus liquid level 17 be slowly dropped to most go up by increasing day displacement
Under portion exploitation coal seam 19, and higher than the second exploitation coal seam 20, and casing pressure is set to gradually rise to 1.2MPa；Then, second is carried out
Mining circulates follow-up voltage stabilizing volume increase, pressure control stable yields, step-down decling phase operation.When casing pressure drops to 0.4MPa again, enter
Enter the circulation of the 3rd mining.By that analogy, until annulus liquid level 17 is down to the foot exploitation ceiling location of coal seam 18.
The above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (1)
1. a kind of region of high stress coal bed gas well closes layer mining technique, and the mining technique is based on conjunction layer mining device to be carried out, conjunction layer
Mining device includes beam pumping unit (1), underground mining tubing string and monitor control system；The beam pumping unit (1) sets
Put on ground；The underground mining tubing string includes the oil pipe (9) being arranged in coal bed gas well production casing (21), is arranged on oil pipe
(9) sucker rod (10) being connected with beam pumping unit (1) and the tubing pump being sequentially connected with sucker rod (10) bottom in
(8), tail pipe (7), manometer (6), gas anchor (5), wire-wrapped screen (4), sand sediment pipe (3) and plug (2)；The Monitoring and Controlling
System includes the casing pressure table (11) being arranged on the flow line of production casing (21) (22) and needle valve (12), is arranged on oil pipe
(9) plug valve (13) on flowing line (23) and the double Read-Out Electronic Gauges being arranged in manometer (6)
(16), double Read-Out Electronic Gauges (16) are connected by cable (15) with the temperature and pressure display instrument (14) for being arranged at ground；Its feature
It is：
The mining technique includes multiple minings circulations, the circulation of each mining be divided into draining build the pressure, voltage stabilizing volume increase, pressure control stable yields,
Step-down decay four-stage；
Built the pressure the stage in the draining of the first mining circulation, close the needle valve (12) of well head, coal bed gas well displacement is controlled in 2m3/
d-4m3/ d, when casing pressure rises to 1.4MPa-1.6MPa, the stage is increased production into voltage stabilizing；Voltage stabilizing increase production the stage, day displacement
Increase to 4m3/d-8m3/ d, is gradually reduced annulus liquid level (17), and casing pressure stabilization is maintained by adjusting needle valve (12), works as coal seam
Gas well daily output tolerance increases to 2000m3During/d, into the pressure control stable yields stage；In the pressure control stable yields stage, casing pressure and daily gas are kept
Amount stabilization, annulus liquid level (17) range of decrease control is down to topmost and develops coal seam in 1.5m/d-2.5m/d, when annulus liquid level (17)
(19) during ceiling location, into the step-down decling phase；In the step-down decling phase, delayed with the speed of 0.01MPa/d-0.03MPa/d
Slow to reduce casing pressure, control annulus liquid level (17) 10m-20m on topmost exploitation coal seam (19) makes coal bed gas well produce tolerance daily
It is slow to decline；When casing pressure drops to 0.4MPa, into the circulation of the second mining；
Built the pressure the stage in the draining of the second mining circulation, annulus liquid level (17) is slowly dropped to topmost by increasing day displacement
Under exploitation coal seam (19), and higher than the second exploitation coal seam (20), and casing pressure is set to gradually rise to 1.2MPa；Then, the is carried out
Two minings circulate follow-up voltage stabilizing volume increase, pressure control stable yields, step-down decling phase operation；When casing pressure drops to 0.4MPa again,
Into the circulation of the 3rd mining；By that analogy, until annulus liquid level (17) is down to foot exploitation coal seam (18) ceiling location.
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| CN104912522B true CN104912522B (en) | 2017-06-23 |
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| CN105332676B (en) * | 2015-12-02 | 2018-01-16 | 中国矿业大学 | Close the mining control method and device of layer exploitation coal bed gas well top payzone exposure |
| CN108071376B (en) * | 2016-11-17 | 2020-10-09 | 中国石油天然气股份有限公司 | Injection and production string in coal-bed gas well |
| CN106988707B (en) * | 2017-04-10 | 2019-12-17 | 中煤科工集团西安研究院有限公司 | Layered pressure control combined drainage and mining device and method for double-coal-bed four-channel packer |
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| CN109458161A (en) * | 2018-10-24 | 2019-03-12 | 中国矿业大学 | A kind of multiple seam independence gas system pressure control list pump mining device and discharge and mining method |
| CN112268833B (en) * | 2020-09-27 | 2024-05-07 | 周少玺 | Multifunctional gas parameter testing instrument and application method thereof |
| CN115707855A (en) * | 2021-08-19 | 2023-02-21 | 中国石油天然气股份有限公司 | Drainage and production control method, device, equipment and storage medium based on hydraulic tubular pump |
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